期刊
PLANETARY AND SPACE SCIENCE
卷 127, 期 -, 页码 33-43出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pss.2016.04.007
关键词
Asteroid; Comet; Grain; Surface motion; Impact motion; Equilibria
资金
- National Basic Research Program of China (973 Program) [2012CB720000]
- State Key Laboratory Foundation of Astronautic Dynamics [2015ADL02]
- National Natural Science Foundation of China [11372150]
We study the motion and equilibria of the grains on the surface of the irregular celestial body (hereafter called irregular bodies). Motions for the grains on the smooth and unsmooth surfaces are discussed, respectively. The linearized equations of motion relative to a surface equilibrium point and its characteristic equations are presented. Considering the stick-slip effect, the damping forces and the spring forces for the grain are calculated, then the linearized equations of motion and the characteristic equations relative to the surface equilibrium points are derived. The number of non-degenerate surface equilibria is an even number. We compute the motion of a grain released above three different regions relative to the irregular asteroid 6489 Golevka, including the flat surface, the concave region, and the convex region. Following the grain release and initial bounce, three kinds of motions exist: the orbital motion, the impact motion and the surface motion. We find that the maximum height of the next hop may be bigger than the maximum height of the current hopping. We also used Monte Carlo simulations to calculate 100 grains' hopping motions, the results shows that the stable surface equilibria are on the concave region and flat surface of the asteroid. (C) 2016 Elsevier Ltd. All rights reserved.
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